CN111274662B

CN111274662B - Screening method and device for convection-communicated old cavity

Info

Publication number: CN111274662B
Application number: CN201811465153.8A
Authority: CN
Inventors: 李建君; 巴金红; 王立东; 王元刚; 薛雨; 周冬林; 陈加松; 刘继芹; 刘春�; 齐得山; 李海伟
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2018-12-03
Filing date: 2018-12-03
Publication date: 2022-10-04
Anticipated expiration: 2038-12-03
Also published as: CN111274662A

Abstract

The invention discloses a screening method and a screening device for convection communication old cavities, and belongs to the technical field of salt cavern gas storage construction. The method comprises the following steps: acquiring a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter; dividing the first cavity wall distance by the first average cavity diameter to obtain a first ratio, dividing the second cavity wall distance by the second average cavity diameter to obtain a second ratio, and dividing the third cavity wall distance by the third average cavity diameter to obtain a third ratio; and when the first ratio, the second ratio and the third ratio are all larger than or equal to the ratio threshold value, determining that the convection communication old cavity is a convection communication old cavity which can be changed into a salt cavern gas storage. The invention can accurately screen the convection communication old cavity which can be reconstructed into the salt cavern gas storage, thereby providing technical support for reconstructing the convection communication old cavity into the salt cavern gas storage.

Description

Screening method and device for convection-communicated old cavity

Technical Field

The invention relates to the technical field of salt cavern gas storage construction, in particular to a screening method and a screening device for convection communication old cavities.

Background

The salt cavern gas storage is used as a matched facility of an oil and gas pipeline, plays an important role in guaranteeing safe and stable gas utilization in the market and seasonal emergency peak regulation, and has the advantages of strong injection and production capacity, good sealing performance, long service life, low comprehensive cost and the like. In order to shorten the construction period of the salt cavern gas storage and save the construction cost of the salt cavern gas storage, an old cavity communicated with a convection current formed in a stratum after salt mining of a salinization enterprise is often reconstructed into the salt cavern gas storage. Because the conditions of the convection communication old cavities are uneven, the convection communication old cavities need to be screened so as to determine the convection communication old cavities suitable for being reconstructed into the salt cavern gas storage, and then the screened convection communication old cavities are reconstructed. However, there is no technology for screening the convection communication old cavity at present, and therefore, a screening method for the convection communication old cavity is urgently needed to fill the blank of the screening technology for the convection communication old cavity and provide technical support for rebuilding the convection communication old cavity into the salt cavern gas storage.

Disclosure of Invention

The embodiment of the invention provides a method and a device for screening a convection communication old cavity, which can solve the problem that the convection communication old cavity cannot be screened in the related art. The technical scheme is as follows:

in a first aspect, a method for screening a convection-connected old cavity is provided, the method comprising:

acquiring a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter;

the first cavity wall distance is the distance between the cavity wall of a first salt cavity and the cavity wall of a first target salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of a second salt cavity and the cavity wall of a second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is a salt cavity in which a vertical well injection and production string which is in convection communication with an old cavity is located, the second salt cavity is a salt cavity in which a horizontal well injection and production string which is in convection communication with an old cavity is located, the first target salt cavity is the closest to the second salt cavity, and the first target salt cavity is the closest to the second salt cavity;

dividing the first cavity wall distance by the first average cavity diameter to obtain a first ratio; dividing the second cavity wall distance by the second average cavity diameter to obtain a second ratio; dividing the third cavity wall distance by the third average cavity diameter to obtain a third ratio;

and when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold value, determining that the convection communication old cavity can be changed into a salt cavern gas storage.

Optionally, before determining that the convection communication old cavity can be changed into a salt cavern gas storage when the first ratio, the second ratio, and the third ratio are all greater than or equal to a ratio threshold, the method further includes:

determining the cavity shape of the salt cavity of the convection communication old cavity, and acquiring the height of the salt cavity of the convection communication old cavity and the rock mechanical parameters of the stratum where the convection communication old cavity is located;

determining the stability parameters of the convection communication old cavity according to the cavity shape and height of the salt cavity of the convection communication old cavity and the rock mechanical parameters of the stratum where the convection communication old cavity is located;

correspondingly, when the first ratio, the second ratio and the third ratio are all greater than or equal to a ratio threshold, determining that the convection communication old cavity can be modified to a salt cavern gas storage includes:

and when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold value, and the stability parameter of the convection communication old cavity meets a preset condition, determining that the convection communication old cavity can be rebuilt into a salt cavern gas storage.

Optionally, before the obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, the method further includes:

acquiring the fault flow conductivity and fracture flow conductivity of the stratum where the convection communication old cavity is located;

and when the fault conductivity is smaller than or equal to the fault conductivity threshold value and the fracture conductivity is smaller than or equal to the fracture conductivity threshold value, the step of obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter is executed.

obtaining the thickness of a salt layer of the stratum where the convection communication old cavity is located and the content of insoluble substances;

and when the thickness of the salt layer is greater than or equal to the thickness threshold of the salt layer and the content of the insoluble substances is less than or equal to the content threshold of the insoluble substances, executing the step of obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter.

acquiring salt mining information of the convection communication old cavity, wherein the salt mining information comprises a salt mining mode, accident information, salt yield of the convection communication old cavity, insoluble substance content and expansion coefficient of insoluble substances;

acquiring the volume of the salt cavity of the convection communication old cavity according to the salt yield, the insoluble substance content and the expansion coefficient of the insoluble substance of the convection communication old cavity;

and when the salt mining mode is not a fracturing mode, the accident information indicates that no ground collapse accident occurs and the volume of the salt cavity of the convection communication old cavity is greater than or equal to the salt cavity volume threshold, executing the step of obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter.

Optionally, before the obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, the method includes:

acquiring ground facility data of a geographical area where the convection communication old cavity is located;

determining the distance between the well mouth of the convection communication old cavity and the ground facilities of the geographic area according to the ground facility data of the convection communication old cavity;

and when the distance between the well mouth of the convection communication old cavity and the ground facility is greater than a distance threshold value, executing the step of acquiring the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter.

In a second aspect, there is provided a screening apparatus in convective communication with an old cavity, the apparatus comprising:

the first acquisition module is used for acquiring a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter;

the calculation module is used for dividing the first cavity wall distance by the first average cavity diameter to obtain a first ratio; dividing the second cavity wall distance by the second average cavity diameter to obtain a second ratio; dividing the third cavity wall distance by the third average cavity diameter to obtain a third ratio;

and the first determining module is used for determining that the convection communication old cavity can be changed into a salt cavern gas storage when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold.

Optionally, the apparatus further comprises:

the second acquisition module is used for determining the cavity shape of the salt cavity of the convection communication old cavity, and acquiring the height of the salt cavity of the convection communication old cavity and rock mechanical parameters of a stratum where the convection communication old cavity is located;

the second determination module is used for determining the stability parameter of the convection communication old cavity according to the cavity shape and height of the salt cavity of the convection communication old cavity and the rock mechanical parameter of the stratum where the convection communication old cavity is located;

accordingly, the first determining module is specifically configured to:

Optionally, the apparatus further comprises:

the third acquisition module is used for acquiring the fault flow conductivity and the fracture flow conductivity of the stratum where the convection communication old cavity is located;

the first triggering module is used for triggering the first acquiring module to acquire a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter when the fault conductivity is smaller than or equal to a fault conductivity threshold and the fracture conductivity is smaller than or equal to a fracture conductivity threshold.

Optionally, the apparatus further comprises:

the fourth acquisition module is used for acquiring the thickness of the salt layer of the stratum where the convection communication old cavity is located and the content of insoluble substances;

and the second triggering module is used for triggering the first acquiring module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the salt layer thickness is greater than or equal to the salt layer thickness threshold and the insoluble content is less than or equal to the insoluble content threshold.

Optionally, the apparatus further comprises:

the fifth acquisition module is used for acquiring salt mining information of the convection communication old cavity, wherein the salt mining information comprises a salt mining mode, accident information, salt yield of the convection communication old cavity, insoluble substance content and expansion coefficient of insoluble substances;

a sixth obtaining module, configured to obtain the volume of the salt cavity of the old convection-communicated cavity according to the salt yield, the insoluble content, and the expansion coefficient of the insoluble in the old convection-communicated cavity;

and the third triggering module is used for triggering the first acquiring module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the salt mining mode is not a fracturing mode, the accident information indicates that the ground collapse accident does not occur, and the volume of the salt cavity communicated with the old cavity by convection is greater than or equal to the salt cavity volume threshold value.

Optionally, the apparatus further comprises:

a seventh obtaining module, configured to obtain ground facility data of a geographic area where the convection communication old cavity is located;

the third determining module is used for determining the distance between the well mouth of the convection communication old cavity and the ground facilities of the geographic area according to the ground facility information of the convection communication old cavity;

and the fourth triggering module is used for triggering the first acquisition module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the distance between the well mouth of the convection communication old cavity and the ground facility is greater than a distance threshold value.

In a third aspect, there is provided a screening apparatus in convective communication with an old cavity, the apparatus comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to perform the steps of the method for screening a convection-connected old chamber according to the first aspect.

In a fourth aspect, a computer-readable storage medium is provided, where instructions are stored on the computer-readable storage medium, and when executed by a processor, the instructions implement the steps of the method for screening a convection-connected old cavity according to the first aspect.

The technical scheme provided by the embodiment of the invention can at least bring the following beneficial effects: in the embodiment of the invention, the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter are obtained. The first cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the first target salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of the second salt cavity and the cavity wall of the second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is a salt cavity in which a straight well injection and production string in convection communication with an old cavity is located, the second salt cavity is a salt cavity in which a horizontal well injection and production string in convection communication with the old cavity is located, the first target salt cavity is a salt cavity in the salt cavities other than the first salt cavity and the third salt cavity, the second salt cavity is a salt cavity in the horizontal well injection and the salt cavity in the old cavity, the salt cavity, the second salt cavity, the third salt cavity is a ratio, and the third salt cavity is obtained by changing the ratio of the average value of the first salt cavity to the ratio of the third salt cavity, and the ratio of the average salt cavity to the ratio of the old cavity. Therefore, the old convection communication cavity capable of being reconstructed into the salt cavern gas storage can be accurately screened out, and technical support is provided for reconstructing the old convection communication cavity into the salt cavern gas storage.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of a first method for screening a convection-coupled old cavity according to an embodiment of the present invention;

FIG. 2 is a flow chart of a second method for screening convection-coupled old cavities according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a convection pass through chamber according to an embodiment of the present invention;

FIG. 4 is a flow chart of a third method for screening convection-coupled old cavities according to an embodiment of the present invention;

FIG. 5 is a flowchart of a fourth method for screening convection-connected old cavities according to an embodiment of the present invention;

FIG. 6 is a flow chart of a fifth method for screening convection-coupled old cavities according to an embodiment of the present invention;

FIG. 7 is a flow chart of a sixth method for screening convection-coupled old cavities according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a screening apparatus in convective communication with an old chamber according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another screening apparatus in convective communication with an old chamber according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a flowchart of a screening method for convection-connected old cavities according to an embodiment of the present invention. Referring to fig. 1, the method includes:

step 101: and acquiring a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter.

The first cavity wall distance is the distance between the cavity wall of a first salt cavity and the cavity wall of a first target salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of a second salt cavity and the cavity wall of a second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is the salt cavity in which a straight well injection and production string in convection communication with an old cavity is located, the second salt cavity is the salt cavity in which a horizontal well injection and production string in convection communication with the old cavity is located, the first target salt cavity is the salt cavity in the closest distance to the first salt cavity except the old salt cavity, and the second target salt cavity are the second salt cavity in the nearest to the old salt cavity.

The salt cavity is a cavity with an irregular shape left after salt is collected in a salt layer by means of water injection, salt dissolution and the like, and the cavities comprise a single-well old cavity and a convection communication old cavity, wherein the single-well old cavity comprises a straight well, and the convection communication old cavity comprises a straight well and a horizontal well which are butted with each other. The first target salt cavity may be a salt cavity where a vertical well injection-production string of a single old well cavity is located, a salt cavity where a vertical well injection-production string of a convection communication old cavity is located, or a salt cavity where a horizontal well injection-production string of a convection communication old cavity is located, as long as it is ensured that the first target salt cavity is a salt cavity closest to the first salt cavity in the salt cavities except the first salt cavity and the second salt cavity, which is not specifically limited in the embodiment of the present invention. Similarly, the second target salt cavity may be a salt cavity where a vertical well injection and production string of a single old well cavity is located, a salt cavity where a vertical well injection and production string of a convection communication old cavity is located, or a salt cavity where a horizontal well injection and production string of a convection communication old cavity is located, as long as it is ensured that the second target salt cavity is a salt cavity closest to the second salt cavity in the salt cavities except the first salt cavity and the second salt cavity, which is not specifically limited in the embodiment of the present invention.

In addition, the first cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the first target salt cavity in the horizontal direction, and the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity are measured on the same horizontal plane. Similarly, the distance between the second salt cavity wall and the second target salt cavity wall is the distance between the second salt cavity wall and the second target salt cavity wall in the horizontal direction, and the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity are measured on the same horizontal plane; the distance between the walls of the first salt cavity and the second salt cavity is the distance between the walls of the first salt cavity and the second salt cavity in the horizontal direction, and the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity are measured on the same horizontal plane.

Step 102: dividing the first cavity wall distance by the first average cavity diameter to obtain a first ratio; dividing the second cavity wall distance by the second average cavity diameter to obtain a second ratio; and dividing the third cavity wall distance by the third average cavity diameter to obtain a third ratio.

It should be noted that the first ratio is obtained by dividing the first cavity wall distance measured on the same horizontal plane by the first average cavity diameter, the second ratio is obtained by dividing the second cavity wall distance measured on the same horizontal plane by the second average cavity diameter, and the third ratio is obtained by dividing the third cavity wall distance measured on the same horizontal plane by the third average cavity diameter.

After the first ratio, the second ratio and the third ratio are obtained in the

above steps

101 and 102, whether the convection communication old cavity can be changed into the salt cavern gas storage or not can be judged according to the first ratio, the second ratio and the third ratio. Specifically, the operation of determining whether the convection communication old cavity can be changed into the salt cavern gas storage according to the first ratio, the second ratio and the third ratio may be implemented as follows in step 103.

Step 103: and when the first ratio, the second ratio and the third ratio are all larger than or equal to the ratio threshold, determining that the convection communication old cavity can be changed into a salt cavern gas storage.

It should be noted that the ratio threshold may be preset according to the requirement of rebuilding the salt cavern gas storage, for example, the ratio threshold may be 2. In practical applications, the same ratio threshold may be set for the first ratio, the second ratio, and the third ratio, or respective ratio thresholds may be set for the first ratio, the second ratio, and the third ratio, for example, the first ratio threshold may be set for the first ratio, the second ratio threshold may be set for the second ratio, and the third ratio threshold may be set for the third ratio.

Specifically, it may be determined that the old convection-connected chamber can be modified to the salt cavern gas storage when the first ratio, the second ratio, and the third ratio are all greater than or equal to the same ratio threshold, and it may be determined that the old convection-connected chamber cannot be modified to the salt cavern gas storage when any one of the first ratio, the second ratio, and the third ratio is less than the ratio threshold. Alternatively, it may be determined that the old convection-connected chamber can be changed to the salt cavern gas storage when the first ratio is greater than or equal to the first ratio threshold, the second ratio is greater than or equal to the second ratio threshold, and the third ratio is greater than or equal to the third ratio threshold, and it may be determined that the old convection-connected chamber cannot be changed to the salt cavern gas storage when any one of the first ratio, the second ratio, and the third ratio is less than the ratio threshold.

Further, since collapse and other accidents are not easy to occur after the old convection communication cavity with good stability is reconstructed into the salt cavern gas storage, referring to fig. 2, in order to ensure that the salt cavern gas storage obtained after the old convection communication cavity is reconstructed has good stability, the stability of the old convection communication cavity can be predicted before step 103, and specifically, the operation of predicting the stability of the old convection communication cavity can be realized by

steps

104 and 105 as follows.

Step 104: determining the shape of the cavity of the salt cavity in convection communication with the old cavity, and acquiring the height of the salt cavity in convection communication with the old cavity and the rock mechanical parameters of the stratum in which the convection communication with the old cavity is located.

It should be noted that, as shown in fig. 3, the cavity in convection communication with the old cavity includes an upper part and a lower part, the upper part is a salt cavity left after salt mining, and the lower part is a cavity occupied by residues left after salt mining. The cavity shape of the salt cavity, which convectively communicates with the old cavity, may be determined using sonar logging techniques.

In addition, the rock mechanical parameters of the stratum in convection communication with the old cavity can comprise at least one of the rock mechanical parameters such as elastic modulus, young modulus and the like. The rock mechanical parameters of the stratum in which the old cavity is in convection communication can be obtained from seismic data of the stratum in which the old cavity is in convection communication before salt extraction.

Wherein, the realization process of obtaining the height of the salt cavity of the convection communication old cavity can be: measuring the depth of the top of the salt cavity and the depth of the bottom of the salt cavity by a logging instrument; and subtracting the depth of the bottom of the salt cavity from the depth of the top of the salt cavity to obtain the height of the salt cavity which is in convection communication with the old cavity.

Step 105: and determining the stability parameters of the convection communication old cavity according to the shape and height of the cavity of the salt cavity in the convection communication old cavity and the rock mechanical parameters of the stratum in which the convection communication old cavity is located.

It should be noted that the stability parameter of the old cavity communicated by convection may include at least one of the stability parameters such as the tensile stress of the cavity wall of the old cavity communicated by convection, the strain of the casing shoe, the expansion coefficient of the old cavity communicated by convection, the volume shrinkage of the old cavity communicated by convection, and the ground settlement speed.

Specifically, the implementation process of step 105 may be: inputting the cavity shape and height of the salt cavity in the convection communication old cavity and the rock mechanical parameters of the stratum in which the convection communication old cavity is located into a simulation model, simulating the gas storage injection and production operation process of the convection communication old cavity within a first preset time period by the simulation model, and outputting the stability parameters of the convection communication old cavity after the simulated injection and production operation process is completed.

It should be noted that the first preset time period may be preset according to a requirement of rebuilding a salt cavern gas storage, and this is not limited in the embodiment of the present invention.

Accordingly, after determining the stability parameter of the convection communication old cavity through step 105, the specific implementation procedure of step 103 may be: and when the first ratio, the second ratio and the third ratio are all larger than or equal to the ratio threshold value, and the stability parameter of the convection communication old cavity meets the preset condition, determining that the convection communication old cavity can be reconstructed into the salt cavern gas storage.

It should be noted that the preset condition may be preset, and the preset condition may include at least one of a preset condition corresponding to a tensile stress of a cavity wall of the convection communication old cavity, a preset condition corresponding to a strain of the casing shoe, a preset condition corresponding to an expansion coefficient of the convection communication old cavity, a preset condition corresponding to a volume shrinkage rate of the cavity of the convection communication old cavity, a preset condition corresponding to a ground settlement speed, and the like. The preset condition corresponding to the tensile stress of the cavity wall of the convection communication old cavity may be that the tensile stress of the cavity wall of the convection communication old cavity is not tensile, the preset condition corresponding to the strain of the casing shoe may be that the strain of the casing shoe is less than 0.3%, the preset condition corresponding to the expansion coefficient of the convection communication old cavity may be that the expansion coefficient of the convection communication old cavity is less than the expansion coefficient threshold, the preset condition corresponding to the cavity volume shrinkage of the convection communication old cavity may be that the cavity volume shrinkage of the convection communication old cavity is less than 20%, and the preset condition corresponding to the ground settlement speed may be that the ground settlement speed is less than or equal to 0.04mm/d (millimeter/day).

In addition, when any one of the first ratio, the second ratio and the third ratio is smaller than a ratio threshold value, and/or any one of the stability parameters of the convection communication old cavity does not meet the corresponding preset condition, it can be determined that the convection communication old cavity cannot be reconstructed into the salt cavern gas storage.

Further, the stability of the convection-connected old cavity may also be predicted in other ways, for example, the stability of the convection-connected old cavity may be predicted by the cavity pressure drop of the convection-connected old cavity before and after production, and the specific implementation process may be: acquiring cavity opening pressure during production of the convection communication old cavity; acquiring the cavity opening pressure after the convection communication old cavity is stopped for a preset time; subtracting the cavity opening pressure after the production of the convection communication old cavity is stopped for a second preset time from the cavity opening pressure during the production of the convection communication old cavity to obtain the cavity pressure drop of the convection communication old cavity; when the cavity pressure drop is less than or equal to the cavity pressure drop threshold, executing step 101; and when the cavity pressure drop is larger than the cavity pressure drop threshold value, determining that the convection communication old cavity can not be reconstructed into the salt cavern gas storage.

It should be noted that the second preset time period and the cavity pressure drop threshold may be preset according to a requirement of rebuilding the salt cavern gas storage, where the second preset time period may be 3 days, 15 days, 1 month, and the like, and the cavity pressure drop threshold may be 0.069MPa/d (MPa/day), 0.055MPa/d, and the like, which is not specifically limited in this embodiment of the present invention.

Further, in order to ensure that the salt cavern gas storage obtained after the old convection communication chamber is reconstructed has good sealing performance, referring to fig. 4, the sealing performance of the old convection communication chamber may be predicted before step 101 is performed, and specifically, the operation of predicting the sealing performance of the old convection communication chamber may be implemented by

steps

106 and 107 as follows.

Step 106: and acquiring the fault flow conductivity and the fracture flow conductivity of the stratum where the old cavity is located in convection communication.

It should be noted that the value of the fracture conductivity of the formation is the product of the length and the width of the fracture included in the seismic data of the formation before salt extraction, and the value of the fracture conductivity of the formation is the product of the length and the width of the fracture included in the seismic data of the formation.

Step 107: and when the fault conductivity of the stratum is smaller than or equal to the fault conductivity threshold value and the fracture conductivity of the stratum is smaller than or equal to the fracture conductivity threshold value, executing the step 101.

Further, when the fault conductivity of the stratum is larger than a fault conductivity threshold value and/or the fracture conductivity of the stratum is larger than a fracture conductivity threshold value, it is determined that the convection communication old cavity cannot be reconstructed into the salt cavern gas storage.

It should be noted that the fault conductivity threshold and the fracture conductivity threshold may be preset according to the requirement of rebuilding the salt cavern gas storage, and this is not specifically limited in the embodiment of the present invention.

In addition, because the fault conductivity and the fracture conductivity of the formation are in a negative correlation with the tightness of the old convection-communicated cavity, that is, the greater the fault conductivity or the fracture conductivity of the formation, the poorer the tightness of the old convection-communicated cavity, so as to ensure that the salt cavern gas storage obtained after the old convection-communicated cavity is reconstructed has good tightness, when the fault conductivity of the formation is less than or equal to the fault conductivity threshold and the fracture conductivity of the formation is less than or equal to the fracture conductivity threshold, step 101 may be executed. When the fault conductivity of the stratum is greater than the fault conductivity threshold and/or the fracture conductivity of the stratum is greater than the fracture conductivity threshold, step 101 may not be performed, and it is directly determined that the convection-connected old cavity cannot be changed into the salt cavern gas storage. Therefore, the screening step of the convection communication old cavity is simplified, and the screening efficiency of the convection communication old cavity is improved.

Further, in order to ensure good economic benefits of the salt cavern gas storage obtained after the old cavity is reconstructed by convection communication, referring to fig. 5, the following

steps

108 and 109 may be performed before step 101 is performed.

Step 108: and obtaining the thickness of the salt layer and the content of insoluble substances in the stratum where the old cavity is in convection communication.

The implementation process of obtaining the thickness of the salt layer of the stratum where the convection communication old cavity is located may be: acquiring the depth of the top of a salt layer and the depth of the bottom of the salt layer, wherein the old cavity is in convection communication with the stratum; and subtracting the depth of the bottom of the salt layer of the stratum where the convection communication old cavity is located from the depth of the top of the salt layer to obtain the thickness of the salt layer of the stratum where the convection communication old cavity is located.

In addition, the implementation process of obtaining the content of the insoluble substances in the stratum where the old cavity is in convection communication can be as follows: measuring the content of insoluble substances at different depths in a salt layer of a stratum in which an old cavity is located through convection communication by a logging instrument; adding the insoluble substance contents at different depths to obtain the insoluble substance content of the stratum where the old cavity is in convection communication.

Step 109: when the salt layer thickness of the formation is greater than or equal to the salt layer thickness threshold and the insolubles content of the formation is less than or equal to the insolubles content threshold, step 101 is performed.

Further, when the thickness of the salt layer of the stratum is smaller than the salt layer thickness threshold value, and/or the insoluble content of the stratum is larger than the insoluble content threshold value, it is determined that the convection communication old cavity cannot be reconstructed into the salt cavern gas storage.

It should be noted that the salt layer thickness threshold and the insoluble content threshold may be preset according to the requirement of rebuilding the salt cavern gas storage, and this is not specifically limited in the embodiment of the present invention.

In addition, as the convection communication old cavity is a cavity with an irregular shape left after salt is mined from a salt layer by means of water injection, salt dissolution and the like, the larger the thickness of the salt layer is, the larger the space of the cavity left after the salt in the salt layer is mined is, and therefore, after the convection communication old cavity is reconstructed into the salt cavern gas storage, the larger the effective space for storing gas is, so that the economic benefit of the salt cavern gas storage obtained after the convection communication old cavity is reconstructed can be improved. And the insoluble substances can expand when meeting water, the larger the content of the insoluble substances in the stratum is, the larger the space occupied by the insoluble substances in the convection communication old cavity after expansion is, so that after the convection communication old cavity is reconstructed into the salt cavern gas storage, the smaller the effective space for storing gas is, and the economic benefit of the salt cavern gas storage obtained after reconstruction of the convection communication old cavity can be reduced. Therefore, the larger the thickness of the salt layer of the stratum is, the smaller the content of insoluble substances in the stratum is, and the better the economic benefit of the salt cavern gas storage obtained after the convection communication old cavity in the stratum is reconstructed is. Therefore, in order to ensure that the salt cavern gas storage obtained after the old cavity is reconstructed through convection communication has good economic benefits, when the thickness of the salt layer of the stratum is greater than or equal to the salt layer thickness threshold value, and the insoluble content of the stratum is less than or equal to the insoluble content threshold value, the step 101 may be executed. When the thickness of the salt layer of the formation is smaller than the thickness threshold of the salt layer, and/or the content of the insoluble substances of the formation is larger than the content threshold of the insoluble substances, step 101 may not be executed, and it is directly determined that the convection communication old cavity cannot be reconstructed as the salt cavern gas storage. Therefore, the screening step of the convection communication old cavity is simplified, and the screening efficiency of the convection communication old cavity is improved.

Further, referring to fig. 6, before performing step 101, the following step 110 and step 111 may also be performed.

Step 110: acquiring salt mining data of the convection communication old cavity, wherein the salt mining data comprises a salt mining mode, accident information, salt yield of the convection communication old cavity, insoluble substance content and expansion coefficient of insoluble substances; and obtaining the volume of the salt cavity which is in convective communication with the old cavity according to the salt yield, the insoluble substance content and the expansion coefficient of the insoluble substance in the convective communication with the old cavity.

The realization process for obtaining the volume of the salt cavity of the convection communication old cavity can be as follows according to the salt yield of the convection communication old cavity, the content of insoluble substances and the expansion coefficient of the insoluble substances: multiplying the content of the insoluble substances by the expansion coefficient of the insoluble substances to obtain the expansion volume of the insoluble substances in the convection communication old cavity; and subtracting the expansion volume of the insoluble substances from the salt yield to obtain the volume of the salt cavity which is in convection communication with the old cavity.

Step 111: and when the salt mining mode is not a fracturing mode, the accident information indicates that the ground collapse accident does not occur and the volume of the salt cavity in convection communication with the old cavity is greater than or equal to the salt cavity volume threshold, executing the step 101.

Further, when the salt mining mode is a fracturing mode, and/or the accident information indicates that a ground collapse accident occurs, and/or the volume of the salt cavity in the convection communication old cavity is smaller than the threshold value of the volume of the salt cavity, it is determined that the convection communication old cavity cannot be reconstructed into the salt cavern gas storage.

It should be noted that the salt cavity volume threshold may be preset according to a requirement of rebuilding the salt cavern gas storage, for example, the salt cavity volume threshold may be 12 ten thousand squares, and the embodiment of the present invention is not particularly limited thereto.

In addition, because a plurality of cracks are left in the stratum after the salt is extracted by adopting the fracturing mode, if the sealing performance of the convection communication old cavity in the stratum is poor, the sealing performance of the salt cavern gas storage obtained after reconstruction cannot be guaranteed. And because the stability of the convection communication old cavity in the stratum with the ground collapse accident is poor, the stability of the salt cavern gas storage obtained after reconstruction cannot be guaranteed. And the larger the volume of the salt cavity communicated with the old cavity in a convection manner is, the better the gas storage capacity of the salt cavern gas storage obtained after reconstruction is, and thus the better the economic benefit of the salt cavern gas storage obtained after reconstruction is. Therefore, when the salt mining mode is not the fracturing mode, the accident information indicates that the ground collapse accident has not occurred, and the volume of the salt cavity in convective communication with the old cavity is greater than or equal to the salt cavity volume threshold, step 101 may be performed. When the salt mining mode is a fracturing mode, and/or the accident information indicates that a ground collapse accident occurs, and/or the volume of the salt cavity in the convection communication old cavity is smaller than the threshold value of the volume of the salt cavity, the step 101 is not executed, and the fact that the convection communication old cavity cannot be reconstructed into the salt cavern gas storage is directly determined. Therefore, the sealing performance, stability and economic benefit of the salt cavern gas storage after the convection communication old cavity is reconstructed are ensured.

Further, referring to fig. 7, before performing step 101, the following steps 112 to 114 may also be performed.

Step 112: and acquiring ground facility data of the geographical area where the convection communication old cavity is located.

It should be noted that the ground facility data may be information on the ground location of the ground facility in convection communication with the geographic area where the old cavity is located. The ground facilities in the geographical area where the old cavity is located in the convection mode can comprise residences, railways, expressways, schools, hospitals, rivers, reservoirs and the like.

Step 113: and determining the distance between the well mouth of the old cavity communicated with the convection and the ground facilities of the geographic area according to the data of the ground facilities of the old cavity communicated with the convection.

Step 114: when the distance between the wellhead in convection communication with the old cavity and the surface facility is greater than the distance threshold, step 101 is executed.

Further, when the distance between the well mouth of the convection communication old cavity and any one of all the surface facilities is smaller than or equal to the distance threshold value, the convection communication old cavity is determined not to be capable of being reconstructed into the salt cavern gas storage.

It should be noted that the distance threshold may be preset, and different distance thresholds may be set for different ground facilities because the ground facilities have different properties and the safety distances between the ground facilities and the old convection-connected cavities are different, for example, the safety distance between a residential building and the old convection-connected cavities needs to be greater than or equal to 100m (meters), the safety distance between a railway and a highway and the old convection-connected cavities needs to be greater than or equal to 200m, and the safety distance between a school, a hospital, a river, and a reservoir and the old convection-connected cavities needs to be greater than or equal to 500m. For example, the distance threshold for a residential home may be 100m, the distance threshold for a railway, a highway may be 200m, and the distance threshold for a school, a hospital, a river, and a reservoir may be 500m. Of course, the distance threshold may also be other distance thresholds, which is not specifically limited in this embodiment of the present invention.

In addition, when the distance between the well head of the old convection communication cavity and one of all the ground facilities is smaller than or equal to the distance threshold, the old convection communication cavity is reconstructed into the salt cavern gas storage to cause potential safety hazards to the one ground facility, so that in order to ensure the safety of the ground facilities in the geographical area where the old convection communication cavity is located, when the distances between the well head of the old convection communication cavity and all the ground facilities are greater than the distance threshold, the step 101 can be executed. When the distance between the well mouth of the convection communication old cavity and any one of all the surface facilities is smaller than or equal to the distance threshold, step 101 may not be executed, and it is directly determined that the convection communication old cavity cannot be modified into the salt cavern gas storage. Therefore, the screening step of the convection communication old cavity is simplified, and the screening efficiency of the convection communication old cavity is improved.

It should be noted that, steps 106 to 107, 108 to 109, 110 to 111, and 112 to 114 are four determination manners, and before step 101 is executed, any one of the four determination manners of steps 106 to 107, 108 to 109, 110 to 111, and 112 to 114 may be executed. Or, at least two determination manners of the four determination manners may be executed (the order of executing the at least two determination manners is not limited in the embodiment of the present invention), when the determination conditions of the at least two determination manners are both satisfied, step 101 is executed, and when the determination condition of any one of the at least two determination manners is not satisfied, step 101 is not executed, and it is directly determined that the convection-connected old cavity cannot be changed into the salt cavern gas storage. For example, before the step 101 is executed, the steps 106 to 107 may be executed, when the judgment conditions of the steps 106 to 107 are satisfied, the step 101 is executed, and when the judgment conditions of the steps 106 to 107 are not satisfied, it is directly determined that the convection communication old cavity cannot be changed into the salt cavern gas storage. For another example, before step 101 is executed, step 106 to step 107 may be executed, step 108 to step 109 may be executed again when the determination conditions of step 106 to step 107 are met, step 101 may be executed when the determination conditions of step 108 to step 109 are met, and when the determination conditions of step 106 to step 107 are not met and/or the determination conditions of step 108 to step 109 are not met, it may be directly determined that the convection communication old cavity cannot be changed to the salt cavern gas storage.

In the embodiment of the invention, the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter are obtained. Because the first cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the first target salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of the second salt cavity and the cavity wall of the second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is a salt cavity where a vertical well injection and production string in convection communication with an old cavity is located, and the second salt cavity is a salt cavity where a horizontal well injection and production string in convection communication with the old cavity is located, the first target salt cavity is a salt cavity which is closest to the first salt cavity in the salt cavities except the first salt cavity and the second salt cavity, and the second target salt cavity is a salt cavity which is closest to the second salt cavity in the salt cavities except the first salt cavity and the second salt cavity, so that after the first cavity wall distance is divided by the first average cavity diameter to obtain a first ratio, the second cavity wall distance is divided by the second average cavity diameter to obtain a second ratio, and the third cavity wall distance is divided by the third average cavity diameter to obtain a third ratio, when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold value, the convection communication old cavity is determined to be a convection communication old cavity which can be changed into a salt cavern gas storage. Therefore, the convection communication old cavity capable of being reconstructed into the salt cavern gas storage can be accurately screened out, and technical support is provided for reconstructing the convection communication old cavity into the salt cavern gas storage.

Fig. 8 is a schematic structural diagram of a screening apparatus in convective communication with an old cavity according to an embodiment of the present invention. Referring to fig. 8, the screening apparatus in convective communication with the old chamber comprises: a first acquisition module 801, a calculation module 802 and a first determination module 803.

The first obtaining module 801 is configured to obtain a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance, and a third average cavity diameter.

The first salt cavity is the closest salt cavity in the salt cavities except the first salt cavity and the second salt cavity to the first salt cavity, the second target salt cavity is the closest salt cavity except the first salt cavity and the second salt cavity to the old salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of the second salt cavity and the cavity wall of the second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is the salt cavity in which a straight well injection and production string in which is in convection communication with the old salt cavity, the second salt cavity is the salt cavity in which is in convection communication with the horizontal well injection and production string in the old salt cavity, the first target salt cavity is the nearest salt cavity except the second salt cavity, and the old salt cavity, and the second salt cavity are in the old salt cavity, and the second salt cavity

A calculating module 802, configured to divide the first cavity wall distance by the first average cavity diameter to obtain a first ratio; dividing the second cavity wall distance by the second average cavity diameter to obtain a second ratio; and dividing the third cavity wall distance by the third average cavity diameter to obtain a third ratio.

A first determining module 803, configured to determine that the convection communication old cavity can be modified to a salt cavern gas storage when the first ratio, the second ratio, and the third ratio are all greater than or equal to the ratio threshold.

Optionally, the apparatus further comprises:

the second acquisition module is used for determining the cavity shape of the salt cavity in convection communication with the old cavity, and acquiring the height of the salt cavity in convection communication with the old cavity and the rock mechanical parameters of the stratum in which the old cavity is located;

the second determination module is used for determining the stability parameter of the convection communication old cavity according to the cavity shape and height of the salt cavity in the convection communication old cavity and the rock mechanical parameter of the stratum in which the convection communication old cavity is located;

accordingly, the first determining module 803 is specifically configured to:

and when the first ratio, the second ratio and the third ratio are all larger than or equal to the ratio threshold value, and the stability parameter of the convection communication old cavity meets the preset condition, determining that the convection communication old cavity can be reconstructed into the salt cavern gas storage.

Optionally, the apparatus further comprises:

the third acquisition module is used for acquiring the fault flow conductivity and the fracture flow conductivity of the stratum where the old cavity is located in convection communication;

the first triggering module is used for triggering the first obtaining module to obtain a first cavity wall distance, a first average cavity diameter, a second cavity wall distance, a second average cavity diameter, a third cavity wall distance and a third average cavity diameter when the fault conductivity is smaller than or equal to the fault conductivity threshold and the fracture conductivity is smaller than or equal to the fracture conductivity threshold.

Optionally, the apparatus further comprises:

the fourth acquisition module is used for acquiring the thickness of a salt layer and the content of insoluble substances in a stratum where the old cavity is in convection communication;

and the second triggering module is used for triggering the first acquiring module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the thickness of the salt layer is greater than or equal to the thickness threshold of the salt layer and the content of the insoluble substances is less than or equal to the content threshold of the insoluble substances.

Optionally, the apparatus further comprises:

the fifth acquisition module is used for acquiring salt mining data of the convection communication old cavity, wherein the salt mining data comprises a salt mining mode, accident information, salt yield of the convection communication old cavity, insoluble substance content and expansion coefficient of insoluble substances;

the sixth acquisition module is used for acquiring the volume of the salt cavity which is in convective communication with the old cavity according to the salt yield, the content of the insoluble substances and the expansion coefficient of the insoluble substances;

and the third triggering module is used for triggering the first acquisition module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the salt mining mode is not the fracturing mode, the accident information indicates that no ground collapse accident occurs and the volume of the salt cavity in convection communication with the old cavity is greater than or equal to the salt cavity volume threshold value.

Optionally, the apparatus further comprises:

the seventh acquisition module is used for acquiring ground facility information of a geographical area where the convection communication old cavity is located;

the third determining module is used for determining the distance between a wellhead of the old cavity communicated with the convection and ground facilities of the geographic area according to the ground facility data of the old cavity communicated with the convection;

and the fourth triggering module is used for triggering the first acquiring module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the distance between the well mouth for convectively communicating the old cavity and the ground facility is greater than the distance threshold.

In the embodiment of the invention, the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter are obtained. The first cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the first target salt cavity, the first average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the first target salt cavity, the second cavity wall distance is the distance between the cavity wall of the second salt cavity and the cavity wall of the second target salt cavity, the second average cavity diameter is the average value of the cavity diameter of the second salt cavity and the cavity diameter of the second target salt cavity, the third cavity wall distance is the distance between the cavity wall of the first salt cavity and the cavity wall of the second salt cavity, the third average cavity diameter is the average value of the cavity diameter of the first salt cavity and the cavity diameter of the second salt cavity, the first salt cavity is a salt cavity in which a straight well injection and production string in convection communication with an old cavity is located, the second salt cavity is a salt cavity in which a horizontal well injection and production string in convection communication with the old cavity is located, the first target salt cavity is a salt cavity in the salt cavities other than the first salt cavity and the third salt cavity, the second salt cavity is a salt cavity in the horizontal well injection and the salt cavity in the old cavity, the salt cavity, the second salt cavity, the third salt cavity is a ratio, and the third salt cavity is obtained by changing the ratio of the average value of the first salt cavity to the ratio of the third salt cavity, and the ratio of the average salt cavity to the ratio of the old cavity. Therefore, the convection communication old cavity capable of being reconstructed into the salt cavern gas storage can be accurately screened out, and technical support is provided for reconstructing the convection communication old cavity into the salt cavern gas storage.

It should be noted that: in the screening device for the old convection-connected cavities provided in the above embodiment, when the old convection-connected cavities are screened, only the division of the functional modules is illustrated, and in practical application, the function distribution can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the screening device for the old convection-communicated cavity and the screening method for the old convection-communicated cavity provided by the embodiments belong to the same concept, and specific implementation processes are described in the method embodiments in detail and are not described again.

Fig. 9 is a schematic structural diagram of a screening apparatus in convection communication with an old cavity according to an embodiment of the present invention, where the screening apparatus in convection communication with the old cavity may be a terminal 900. Terminal 900 may be: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III, motion video Experts compression standard Audio Layer 3), an MP4 player (Moving Picture Experts Group Audio Layer IV, motion video Experts compression standard Audio Layer 4), a notebook computer, or a desktop computer. Terminal 900 may also be referred to by other names such as user equipment, portable terminals, laptop terminals, desktop terminals, etc.

In general, terminal 900 includes: a processor 901 and a memory 902.

Processor 901 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so forth. The processor 901 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 901 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 901 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed by the display screen. In some embodiments, the processor 901 may further include an AI (Artificial Intelligence) processor for processing computing operations related to machine learning.

Memory 902 may include one or more computer-readable storage media, which may be non-transitory. The memory 902 may also include high-speed random access memory as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 902 is used to store at least one instruction for execution by processor 901 to implement the method of screening a fluidically connected old lumen provided by the method embodiments of the present application.

In some embodiments, terminal 900 can also optionally include: a peripheral interface 903 and at least one peripheral. The processor 901, memory 902, and peripheral interface 903 may be connected by buses or signal lines. Various peripheral devices may be connected to the peripheral interface 903 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit 904, a touch display screen 905, a camera 906, an audio circuit 907, a positioning component 908, and a power supply 909.

The peripheral interface 903 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 901 and the memory 902. In some embodiments, the processor 901, memory 902, and peripheral interface 903 are integrated on the same chip or circuit board; in some other embodiments, any one or both of the processor 901, the memory 902, and the peripheral interface 903 may be implemented on a separate chip or circuit board, which is not limited in this application.

The Radio Frequency circuit 904 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 904 communicates with communication networks and other communication devices via electromagnetic signals. The radio frequency circuit 904 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 904 comprises: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, etc. The radio frequency circuit 904 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the radio frequency circuit 904 may also include NFC (Near Field Communication) related circuits, which are not limited in this application.

The display screen 905 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display screen 905 is a touch display screen, the display screen 905 also has the ability to capture touch signals on or over the surface of the display screen 905. The touch signal may be input to the processor 901 as a control signal for processing. At this point, the display 905 may also be used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the display 905 may be one, disposed on the front panel of the terminal 900; in other embodiments, the number of the display panels 905 may be at least two, and each of the display panels is disposed on a different surface of the terminal 900 or is in a foldable design; in still other embodiments, the display 905 may be a flexible display disposed on a curved surface or a folded surface of the terminal 900. Even more, the display 905 may be arranged in a non-rectangular irregular pattern, i.e., a shaped screen. The Display panel 905 may be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), or other materials.

The camera assembly 906 is used to capture images or video. Optionally, camera assembly 906 includes a front camera and a rear camera. Generally, a front camera is disposed at a front panel of the terminal, and a rear camera is disposed at a rear surface of the terminal. In some embodiments, the number of the rear cameras is at least two, and each rear camera is any one of a main camera, a depth-of-field camera, a wide-angle camera and a telephoto camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, the main camera and the wide-angle camera are fused to realize panoramic shooting and a VR (Virtual Reality) shooting function or other fusion shooting functions. In some embodiments, camera assembly 906 may also include a flash. The flash lamp can be a monochrome temperature flash lamp or a bicolor temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.

Audio circuit 907 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals to the processor 901 for processing, or inputting the electric signals to the radio frequency circuit 904 for realizing voice communication. For stereo sound acquisition or noise reduction purposes, the microphones may be multiple and disposed at different locations of the terminal 900. The microphone may also be an array microphone or an omni-directional acquisition microphone. The speaker is used to convert electrical signals from the processor 901 or the radio frequency circuit 904 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, audio circuit 907 may also include a headphone jack.

The positioning component 908 is used to locate a current geographic Location of the terminal 900 for navigation or LBS (Location Based Service). The Positioning component 908 may be a Positioning component based on the GPS (Global Positioning System) in the united states, the beidou System in china, the graves System in russia, or the galileo System in the european union.

Power supply 909 is used to provide power to the various components in terminal 900. The power source 909 may be alternating current, direct current, disposable or rechargeable. When power source 909 comprises a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.

In some embodiments, terminal 900 can also include one or more sensors 910. The one or more sensors 910 include, but are not limited to: acceleration sensor 911, gyro sensor 912, pressure sensor 913, fingerprint sensor 914, optical sensor 915, and proximity sensor 916.

The acceleration sensor 911 can detect the magnitude of acceleration in three coordinate axes of the coordinate system established with the terminal 900. For example, the acceleration sensor 911 may be used to detect the components of the gravitational acceleration in three coordinate axes. The processor 901 can control the touch display 905 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 911. The acceleration sensor 911 may also be used for acquisition of motion data of a game or a user.

The gyro sensor 912 can detect the body direction and the rotation angle of the terminal 900, and the gyro sensor 912 can cooperate with the acceleration sensor 911 to acquire the 3D motion of the user on the terminal 900. The processor 901 can implement the following functions according to the data collected by the gyro sensor 912: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization while shooting, game control, and inertial navigation.

Pressure sensors 913 may be disposed on the side bezel of terminal 900 and/or underneath touch display 905. When the pressure sensor 913 is disposed on the side frame of the terminal 900, the user's holding signal of the terminal 900 may be detected, and the processor 901 performs left-right hand recognition or shortcut operation according to the holding signal collected by the pressure sensor 913. When the pressure sensor 913 is disposed at a lower layer of the touch display 905, the processor 901 controls the operability control on the UI interface according to the pressure operation of the user on the touch display 905. The operability control comprises at least one of a button control, a scroll bar control, an icon control and a menu control.

The fingerprint sensor 914 is used for collecting a fingerprint of the user, and the processor 901 identifies the user according to the fingerprint collected by the fingerprint sensor 914, or the fingerprint sensor 914 identifies the user according to the collected fingerprint. Upon recognizing that the user's identity is a trusted identity, processor 901 authorizes the user to perform relevant sensitive operations including unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings, etc. The fingerprint sensor 914 may be disposed on the front, back, or side of the terminal 900. When a physical key or vendor Logo is provided on the terminal 900, the fingerprint sensor 914 may be integrated with the physical key or vendor Logo.

The optical sensor 915 is used to collect ambient light intensity. In one embodiment, the processor 901 may control the display brightness of the touch display 905 based on the ambient light intensity collected by the optical sensor 915. Specifically, when the ambient light intensity is high, the display brightness of the touch display screen 905 is increased; when the ambient light intensity is low, the display brightness of the touch display screen 905 is turned down. In another embodiment, the processor 901 can also dynamically adjust the shooting parameters of the camera assembly 906 according to the ambient light intensity collected by the optical sensor 915.

Proximity sensor 916, also known as a distance sensor, is typically disposed on a front panel of terminal 900. The proximity sensor 916 is used to collect the distance between the user and the front face of the terminal 900. In one embodiment, when the proximity sensor 916 detects that the distance between the user and the front face of the terminal 900 gradually decreases, the processor 901 controls the touch display 905 to switch from the bright screen state to the dark screen state; when the proximity sensor 916 detects that the distance between the user and the front surface of the terminal 900 gradually becomes larger, the processor 901 controls the touch display 905 to switch from the breath screen state to the bright screen state.

Those skilled in the art will appreciate that the configuration shown in fig. 9 does not constitute a limitation of terminal 900, and may include more or fewer components than those shown, or may combine certain components, or may employ a different arrangement of components.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A method of screening for old cavities in convective communication, the method comprising:

2. The method of claim 1, wherein before determining that the convectively-connected legacy chamber can be reconfigured to a salt cavern reservoir when the first ratio, the second ratio, and the third ratio are each greater than or equal to a ratio threshold, further comprising:

and when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold value, and the stability parameter of the convection communication old cavity meets a preset condition, determining that the convection communication old cavity can be changed into a salt cavern gas storage.

3. The method of claim 1 or 2, wherein prior to obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, further comprising:

4. The method of claim 1 or 2, wherein prior to obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, further comprising:

obtaining the thickness of a salt layer and the content of insoluble substances of the stratum where the convection communication old cavity is located;

5. The method of claim 1 or 2, wherein prior to obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, further comprising:

obtaining the volume of the salt cavity of the convection communication old cavity according to the salt yield, the insoluble substance content and the expansion coefficient of the insoluble substance of the convection communication old cavity;

and when the salt mining mode is not a fracturing mode, the accident information indicates that the ground collapse accident does not occur, and the volume of the salt cavity for convectively communicating the old cavity is greater than or equal to the salt cavity volume threshold, the step of obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter is executed.

6. The method of claim 1 or 2, wherein prior to obtaining the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance, and the third average cavity diameter, comprises:

determining the distance between the wellhead of the old convection communication cavity and the ground facilities of the geographic area according to the ground facility data of the old convection communication cavity;

7. A screening device in convective communication with an old cavity, the device comprising:

and the first determination module is used for determining that the convection communication old cavity can be reconstructed into a salt cavern gas storage when the first ratio, the second ratio and the third ratio are all larger than or equal to a ratio threshold.

8. The apparatus of claim 7, wherein the apparatus further comprises:

accordingly, the first determining module is specifically configured to:

9. The apparatus of claim 7 or 8, wherein the apparatus further comprises:

10. The apparatus of claim 7 or 8, wherein the apparatus further comprises:

11. The apparatus of claim 7 or 8, further comprising:

the sixth obtaining module is used for obtaining the volume of the salt cavity of the convection communication old cavity according to the salt yield, the insoluble substance content and the expansion coefficient of the insoluble substance of the convection communication old cavity;

and the third triggering module is used for triggering the first acquisition module to acquire the first cavity wall distance, the first average cavity diameter, the second cavity wall distance, the second average cavity diameter, the third cavity wall distance and the third average cavity diameter when the salt mining mode is not the fracturing mode, the accident information indicates that the ground collapse accident does not occur and the volume of the salt cavity of the convection communication old cavity is greater than or equal to the salt cavity volume threshold value.

12. The apparatus of claim 7 or 8, further comprising:

a seventh obtaining module, configured to obtain ground facility information of a geographic area where the convection communication old cavity is located;

the third determining module is used for determining the distance between the wellhead of the convection communication old cavity and the ground facility of the geographic area according to the ground facility data of the convection communication old cavity;